static Class getOuterClass(Class c) {
  ret getOuterClass(c, null);
}

static Class getOuterClass(Class c, O classFinder) ctex {
  S s = c.getName();
  int i = s.lastIndexOf('$');
  S name = substring(s, 0, i);
  if (classFinder != null) ret (Class) callF(classFinder, name);
  ret Class.forName(name);
}